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Template Rendering

You reference template variables with {{double_brace}} syntax. The data comes from initial_context, including values returned by a Pre-Call Data Fetch, and from gathered_context in Webhook payloads. The syntax depends on where you use it:

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Agent node prompts

In an Agent node prompt, reference each initial_context field directly by name. Nested values are supported with dot notation. Example: if the initial context is
write your prompt to access the user’s name as below: Prompt: You are Alice, who is talking to {{user.name}}.
Variables extracted during the call (gathered_context) are not available in Agent prompts — a prompt can only reference initial_context fields. To act on extracted data, send it to a Webhook Node.

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Webhook Node payloads

When constructing a Webhook Node payload, the context objects are nested under their names, so reference them with the initial_context. and gathered_context. prefixes: Payload value: {{initial_context.user.name}} or {{gathered_context.call_disposition}}

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Using Template Variables for Testing

Template variables defined in your workflow Settings > Context Variables are included in test calls (both web and phone) made from the workflow editor. This is useful for simulating data that would normally come from telephony. Template Variables panel in workflow Settings, showing a customer_name variable and fields to add new key/value pairs For example, you can set caller_number and called_number as context variables to test Pre-Call Data Fetch without needing a real inbound call. Browser voice tests use the same context model as inbound calls.
These context variables are only used during test calls from the workflow editor. On production inbound calls, the actual telephony data is used and these values are ignored.

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Nodes

Tig.ai Voice Agents are composed of various nodes. These nodes provide instructions to the voice agent, configure inbound conversations, and send results to your systems with a webhook. In the next steps, we will document the nodes you can use to build the voice agent.